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- W1496558462 abstract "1. Single giant barnacle muscle fibres from Megabalanus psittacus (Darwin) were used to establish the possible role of extracellular Ca2+ in triggering the contraction. 2. Peak tension p0 during twitches elicited by depolarizing voltage clamp pulses decreases after the removal of Ca2+ from the external saline. p0 becomes too small to measure after a few minutes, when the model‐estimated level of total intracellular Ca has been reduced to 99.5% of its original value and the extracellular Ca in the clefts and/or tubules to about 10%. 3. In fibres where the outward currents were blocked by internal perfusion with Cs+, the curves of the integral of the inward current versus membrane potential and of peak tension versus membrane potential follow a similar pattern. 4. When Ca2+ in the external saline was replaced by Ba2+ or Sr2+, no twitches were generated although depolarizing voltage clamp pulses induced large inward currents comparable to those measured when Ca2+ was present. 5. It is concluded that an increase in Ca2+ in the fibre during the Ca2+ inward current is a necessary condition for the triggering of the development of tension. The data on Ba2+ inhibition is consistent with the hypothesis that there are two different intracellular sites of action for Ca2+." @default.
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- W1496558462 date "1979-03-01" @default.
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- W1496558462 title "On the role of extracellular calcium in triggering contraction in muscle fibres from barnacle under membrane potential control." @default.
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- W1496558462 doi "https://doi.org/10.1113/jphysiol.1979.sp012697" @default.
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